A level Biology: Post your doubts here!

[Psyvlone007]

check this as well


check this as well

Thankss alot brother atleast someone feels for others unlike many

 

[amina1300]

Here is the guess paper attached. I hope it is useful and sorry it was serial dilutions.

Lastly Plz pray for my maths P3 exam tmrw .

 

[amina1300]

Do you have the guess paper? Or the one yiu are refering to?

^^^^

 

[Hisham Khan]

^^^^

You are an angel ))

 

[Psyvlone007]

^^^^

thanks alotttt.

 

[Psyvlone007]

You are an angel ))

True xD

 

[Hisham Khan]

^^^^

btw the structure which you have labelled on 2nd pic on the cell is cytoplasm not cell membrane I think ......

 

[Hisham Khan]

^^^^

Sorry to distrub ou sis but do you have q2 as well .
And I'll surely pray for you maths paper.
Best of luck and inshallah youll get a A

 

[Psyvlone007]

btw the structure which you have labelled on 2nd pic on the cell is cytoplasm not cell membrane I think ......

Doesnt the cell membrane pull off?

 

[Psyvlone007]

had a question. if the pointsbon a graph are kinda bit scattered and the examiner hasnt asked for a line of best fit. We will be joing the points with scaled lines, right?

 

[A*****]

had a question. if the pointsbon a graph are kinda bit scattered and the examiner hasnt asked for a line of best fit. We will be joing the points with scaled lines, right?

Yesss

 

[A*****]

Doesnt the cell membrane pull off?

Yeah it does and the diagram is correctly labelled

 

[Hisham Khan]

The paper was not hard tbh rather it was easy because they gave more then required steps and Alot of hints which werent needed especially in the test section.
This could have been very hard as well and the graph and table were pretty straight forward as well.
Lets hopes our practical paper is even easier then this insahallah.

 

[angryrider_56]

Here is the guess paper attached. I hope it is useful and sorry it was serial dilutions.

Lastly Plz pray for my maths P3 exam tmrw .

Best of luck for you brother, Hopefully, you ace this exam.
Any chance that you have prediction paper for bio 34? or guess paper? (i know it's a yeast experiment but any idea what it might be?)

 

[Hisham Khan]

Amina I love you!!!!!!!. OMG.
Simple dilution came and 3 marks for improvemesnts 1 for error graph came as in our paper which you gave and 1 bar chart came!!!!!!.

The style was almost the same!!! thank you so much!.

Put 3cm cubed of H and 2 cm cubed of U and 2cm3of benedict etc
D

 

[Kanekii]

Best of luck for you brother, Hopefully, you ace this exam.
Any chance that you have prediction paper for bio 34? or guess paper? (i know it's a yeast experiment but any idea what it might be?)

I hope its not serial dilution i hate it..

 

[A*****]

Amina I love you!!!!!!!. OMG.
Simple dilution came and 3 marks for improvemesnts 1 for error graph came as in our paper which you gave and 1 bar chart came!!!!!!.

The style was almost the same!!! thank you so much!.

Put 3cm cubed of H and 2 cm cubed of U and 2cm3of benedict etc
D

Lollll the pattern is the same in every paper and the improvements, bar chart, etc come in almost every paper

 

[angryrider_56]

So guys anyone has the prediction paper or the guess paper for Bio 34? Mind sharing it please?

 

[Hisham Khan]

Lollll the pattern is the same in every paper and the improvements, bar chart, etc come in almost every paper

You'll have no idea how similar it was until you see it yourself.
I think I did the bio practical much better for which I didn't even practice that much then the chemistry one for which I id over 26 practicals lol.

 

[Hisham Khan]

I hope its not serial dilution i hate it..

It's easy brother.I think you'll be fully be able to understand it after this video.

Basically if you want to half concentration of let say 20 cm3,which's concentration is 1 mol dm-3, you take 10 cm3 from the beaker contaning 20 cm3 of solution and add it to other beaker +10 cm3 water.Then you take 10 cm3 solution from THAT Beaker which you added water too and add it to other beaker and add furthur 10 cm3 water and so on.

But if you want concentration to be 1/10th of the orignal ,you just take lets say if you have 10 cm3 of solution,you take 1 cm3 from 10 (remember 1/10th!) and add it to other beaker and to equal volume of 10,9cm3 water!!!!.Then you take 1cm3 from that beaker and add 9 cm3 water to other beaker and repeat so on until how much you want to!

For simple dilution just remember the formula which is
volume of solution=Conc to be made into total volume/total concentration.
Lets say you ahve 20 cm3 of 1 mol dm3 solution and you need to make dilutions of it like 0.8 mol dm3 0.6 0.2 etc.
So for 0.8,volume of solution will be =0.8 into 20/1. And whatever the volume of solution you get add water to get the totaly volume of the liquid which remains constant throughout